That article is frightening.
Particularly...
"Forget that Dr. McCully had found the narrowing of arteries in carotid (neck) arteries that facilitate delivery of oxygen to the brain are narrowed (called carotid artery stenosis) due to elevated homocysteine. The higher the blood serum levels of homocysteine the greater the risk for narrowing of carotid (neck) arteries. Elevated homocysteine is a result of a deficiency of vitamins B6, B12, B9 (folate or folic acid) and betaine."
And, it's not just elevated homocysteine.
Low blood ox
Low blood ox at DuckDuckGo has a direct effect on how our brain functions.
Even if you have never smoked, environmental factors, second-hand smoke and industrial pollutants affects your quality of life.